ZBrushCentral

Smart resym doesn't work with higher subdivisions?

Hey all, just wondering if anyone else has experienced this? I accidently smart resym and area of my character at subdivision 6 and now its just hanging and curser swirling for what seems like forever. I’m going to have to terminate zbrush and loose a good couple of hours work (yes I’m an idiot for not saving!) Is it know to crash when trying to perform at such a high subdivision?